Processes for the production of electrophoretic displays

Coating processes – Direct application of electrical – magnetic – wave – or... – Electrostatic charge – field – or force utilized

Reexamination Certificate

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C427S472000, C427S473000, C427S162000, C427S212000, C427S213310, C430S032000, C430S035000, C359S296000

Reexamination Certificate

active

07910175

ABSTRACT:
A coating of an encapsulated electrophoretic medium is formed on a substrate (106) by dispersing in a fluid (104) a plurality of electrophoretic capsules (102), contacting at least a portion of a substrate (106) with the fluid (104); and applying a potential difference between at least a part of the portion of the substrate (106) contacting the fluid (104) and a counter-electrode (110) in electrical contact with the fluid (104), thereby causing capsules (102) to be deposited upon at least part of the portion of the substrate (106) contacting the fluid (102). Patterned coatings of capsules containing different colors may be deposited in registration with electrodes using multiple capsule deposition steps. Alternatively, patterned coatings of capsules may be formed by applying a fluid form of an electrophoretic medium to a substrate, and applying a temporally varying voltage between an electrode and the substrate. The process may be repeated to allow for deposition of full color displays.

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